Hi Stem,
I will photograph the block for you, but that was what I thought it be, having researched it extensively on Google. However it is better to be safe then sorry. Thanks for your quick reply.
Hi I am about to embark on fitting my Hive Thermostat to the above boiler. There is currently no existing thermostat in the house, but the boiler does have a built in timer. Does anyone have a wiring diagram or has already fitting one to this boiler so that when I connect the receiver, it will...